The bar represents the synchronization of the completion of those activities. It shows where the exit transition from a state or activity may branch in alternative directions depending on a condition. Decision activity is introduced in UML to support conditionals in activities. The state defines the current condition of an event or activity. An activity is a unit of work that needs to be carried out. It is the point at which you begin reading the action sequence. The initial state is the starting point in the activity diagram. The activity diagrams consist of activities, states, and transitions between activities and states. It is used to model how activities are coordinated to provide a service, to show the events needed to achieve some operation, and to illustrate how the events in a single-use case relate to one another. The purpose of an activity diagram is to describe the procedural flow of actions as part of an activity. Look at this table to figure out the differences between various UML diagrams. To present the proposed designs and communicate with stakeholders. To detect errors and omissions early in the life cycle. It's an international industry standard graphical notation used for describing, visualizing, constructing, and documenting the artifacts of a software system. UML stands for Unified Modeling Language. Here is a simple introduction on different types of UML diagrams, including class, activity, component, collaboration, sequence, use case, deployment, statechart, and package diagrams, listing their purposes and usages.
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